Обший каталог Yamawa 2016 - 2017 - страница 727

Flowchart : M12 tapping
Check 1
PD PD
Boring before tapping


Engagement ratio on cutting taps


Engagement ratio on roll taps
Internal threads
Min
Min 100%
100%
Max 82.3%


Internal threads
M2


Internal threads
Ta
ps

M3
Min Max Ta
ps
Length of
Length of engagement
Max engagement=18.1mm 82.3%
74.1%
On "middle" engagement class, 7H class can be chosen
in case of "L" engagement length. Internal threads made by roll taps are M4
Engagement Internal threads
different from those made by cutting Ta
taps on the shape of minor dimameter. ps
Symbol


classification
Middle
Coarse


Unit : mm
Engagement
Fine


Unit : mm
d=12.0mm


Engagement
length External threads D1
length classification Drill size *Hole size for thread forming taps
(ref.) Min Max M5
S Short engagement length 4H 5H — S 6(mm) Min Max Ta
M Normal engagement length 5H 6H 7H 6 M 18(mm)
Bored hole size 10.3 10.106 10.441 11.09 11.23 ps
L Long engagement length 6H 7H 8H 18 L(mm)
Engagement ratio 89.7% 100% 82.3% Forming condition changes depending
on workpiece's Material and shape.
P=1.75mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads Above is for customer's reference.
M6
Ta
ps

Tolerance area of tap's pitch diameter M8
Thread class of cutting taps Ta
ps
【Pitch diameter】
Diameter of imaginary cylinder or cone Internal threads Class PD tolerance
ISO2 48μm〜80μm
Check 2


which makes equal the width of threads
and width of space between the threads M1
ISO2X 73μm〜105μm Ta 0
ps
*Above shows the plus tolerance
ISO2 by setting PD basic size as "0".
ISO2X M1
Ta 2
Width of ps
threads Thread class of roll taps
Width of space Class PD tolerance
M1
between threads ISO2X 127μm〜140μm Ta -M7
ps
Pitch
Threading


diameter ISO3X 152μm〜165μm
ISO2X *Above shows the plus tolerance
M9
Ta -M2
by setting PD basic size as "0".
ISO3X ps 4

Basic size of pitch diameter
10.863mm M2
Ta 5-M4
-200μm -150μm -100μm -50μm +50μm +100μm +150μm +200μm ps 8
For
6g ISO2X ISO3X ← Roll taps thr Unifi
e e
Ta ads d
p s
Tolerance of dies is the ISO2 ← Cutting taps
target of external threads
ISO2X For
W
Class of dies thre hitwo
a r
Ta ds th
6g Solid dies 6g external threads(-184〜-34) 6H internal threads(0〜200) ps
NR GR GP NP
For
P
Ta ipe thre
Relative position of PD tolerance area of external threads, internal threads, taps and gages. ps ads

For
P
Ta g thre
(–) ← Basic size of pitch diameter → (+) ps ad
s
10.863mm
Unit : m Unit : m
Check 3


Ring gage pitch diameter(for external threads inspection) Plug gage pitch diameter(for internal threads inspection)
NR6g -202 〜 -184 GR6g -51 〜 -33 GP6H 7 〜 17 NP6H 200 〜 210
Gage check


NR : NOT GO ring gage GP : GO plug gage
GR : GO ring gage NP : NOT GO plug gage
Unit : mm Unit : mm
Accuracy of external threads Accuracy of internal threads
Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter
6g 11.701〜11.966 10.679〜10.829 − 6H − 10.863〜11.063 10.106〜10.441


Sizes-26
For improvement, spec may change without advance notice. 723